OCMM Midline Boone and Paired Bones

Question 1

Sphenobasilar synchondrosis (SBS)

Answer 1

junction of the sphenoid and base of the occiput “sphenobasilar junction”

Question 2

“sphenobasilar junction”

Answer 2

synchondrosis joint - remember HYALINE cartilage

Question 3

What are the normal cranial motions

Answer 3

flexion and extension

Question 4

cranial midline bones?

Answer 4

occiput and sphenoid

Question 5

Facial midline bones?

Answer 5

vomer
ethmoid
mandible

Question 6

When the SBS is in flexion, the ethmoid bone will move in the same direction as what?

Answer 6

the occiput

Question 7

When the SBS is in flexion, the vomer will move in the same direction as what bone?

Answer 7

the sphenoid

Question 8

What is the only cranial bone in contact with all 4 fontanelles?

Answer 8

the parietal bone (anterior, anterolateral, posterior and posterolateral)

Question 9

Physiological motion of the parietal bones when the cranium is in flexion?

Answer 9

external rotation; cranium widens laterally

Question 10

Physiological motion of the parietal bones when the cranium is in extension?

Answer 10

internal rotation; cranium narrows laterally

Question 11

Which foramen does the internal carotid artery travel through?

Answer 11

foramen lacerum (petrous part of the temporal bone)

Question 12

Vault contact fingering positioning?

Answer 12

thumbs on frontal bones
index finger on greater sphenoid wings
middle finger on temporal bone
4th fingers on mastoid process
5th digit on occiput
palms on parietals